该工艺包括2个步骤,首先是甘油与氯化氢在催化剂作用下反应生成二氯丙醇,再与液碱反应生成环氧氯丙烷。核心技术是氯化工艺和高效催化剂的选择。近年来甘油法的改进主要体现在反应器和催化剂两个方面。在固定床反应器中研究乙酸、草酸等对氯化反应的催化效果。结果表明,草酸和一氯乙酸作催化剂时,二氯丙醇的选择性很好,但甘油转化率低。用丙二酸、己二酸和葵二酸作催化剂时,甘油转化率有所提高,但二氯丙醇选择欠佳。当用冰醋酸作催化剂时,二氯丙醇选择性和甘油转化率都较高,分别为90.3%和85,5%。 The process includes two steps. Firstly, glycerol and hydrogen chloride react with dichlorohydrin under the action of a catalyst to react with a caustic soda to form epichlorohydrin. The core technology is the choice of chlorination process and efficient catalyst. In recent years, the improvement of glycerol method is mainly reflected in two aspects of the reactor and catalyst. In a fixed bed reactor acetic acid, oxalic acid and other catalytic effect of chlorination. The results showed that the selectivity of dichloropropanol was good when oxalic acid and monochloroacetic acid were used as catalysts, but the glycerol conversion was low. With the use of malonic acid, adipic acid and sebacic acid as catalysts, the conversion of glycerol has increased, but the poor selectivity of dichlorohydrin. When using glacial acetic acid as a catalyst, the selectivity to dichloropropanol and the glycerol conversion were both 90.3% and 85.5%, respectively.